材料期刊网

Ni-Cu-x(x=Si,Cr)合金时效初期调幅组织的TEM研究

江伯鸿 , R.Wagner

金属学报

<正> 调幅组织(modulated structure)可以通过调幅分解(spinodal Decomposition)而产生,使合金获得成分不同的呈周期规则排列的两相结构;它也可通过形核-长大机制,即在长大(或粗化)过程中由于各向异性的共格应变能的作用,形成有取向的规则排列的两相组织。因此相分解的两种机制:调幅分解和形核-长大,在相变后期都可获得几乎相同的调幅组织,难以区分。 有人认为电子衍射中出现卫星反射(Satellite)(或X衍射中出现边带)和TEM

关键词:

Wagner极化法对熔渣电子电导的研究

鲁雄刚 , 丁伟中 , 李福燊 , 李丽芬 , 周国治

金属学报

利用Wagner极化法对CaO-SiO2-Al2O3-FeOx熔渣体系的电子电导进行了测定.研究表明,熔渣的电子电导包含自由电子电导和电子空穴电导两部分,它们分别由渣相中的Fe3+及Fe2+浓度所确定.随着渣相的温度升高,Fe3+转变为Fe2+,自由电子电导逐渐减小,而电子空穴电导逐渐增大.实验还发现,在特定的温度下,不同渣系的电子电导在某一Fe3+浓度含量存在一个最大值.在本实验条件下,电子电导率的大小处于10-4-10-2S@cm-1之间

关键词: Wagner极化法 , null , null

Wagner极化法对熔渣电子电导的研究

鲁雄刚 , 丁伟中 , 李福燊 , 李丽芬 , 周国治

金属学报 doi:10.3321/j.issn:0412-1961.2001.02.015

利用Wagner极化法对CaO-SiO2-Al2O3-FeOx熔渣体系的电子电导进行了测定.研究表明,熔渣的电子电导包含自由电子电导和电子空穴电导两部分,它们分别由渣相中的Fe3+及Fe2+浓度所确定.随着渣相的温度升高,Fe3+转变为Fe2+,自由电子电导逐渐减小,而电子空穴电导逐渐增大.实验还发现,在特定的温度下,不同渣系的电子电导在某一Fe3+浓度含量存在一个最大值.在本实验条件下,电子电导率的大小处于10-4-10-2S@cm-1之间

关键词: Wagner极化法 , 熔渣 , 电子电导

汽车用先进高强度钢板的可镀性与Wagner模型预测效果研究现状

刘华初 , 何燕霖 , 王利 , 李麟 , 史文

材料保护

先进的高强度钢板(AHSS)是汽车减重降耗的理想材料,但在连续热浸镀锌生产线上,这类钢容易因表面氧化而产生漏镀点,对防腐蚀不利.鉴于Wagner模型可用以预测钢的表面氧化情况,对该模型进行了分析,结合钢的成分和退火工艺,探讨了影响AHSS可镀性的主要因素,并且指出完善Wagner模型可以指导AHSS合金化设计与镀锌工艺制定.

关键词: 连续热浸镀锌 , Wagner模型 , 可镀性 , 汽车用先进高强度钢

1,1,2,2-四氟乙烷（R134）的饱和蒸汽压实验研究

董学强 , 公茂琼 , 郭浩 , 吴剑峰

工程热物理学报

在243.168～293.182 K的温度范围内,采用自行设计搭建的高精度可视化相平衡实验系统测量了1,1,2,2四氟乙烷（R134）的饱和蒸气压实验数据,温度和压力的测量不确定度分别小于5 mK和0.5 kPa。用Wagner型方程对实验数据进行了关联,并与文献数据进行了对比,获得了良好的一致性。

关键词: R134 , Wagner方程 , 饱和蒸汽压 , 实验测量

R-line thermal shift and thermal broadenings of R, R' and B lines for ruby

Communications in Theoretical Physics

The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.

关键词: diamond anvil cell;pressure measurement;spectroscopy;temperatures

Theoretical calculations of thermal broadenings and transition probabilities of R, R ' and B line-groups for ruby

Communications in Theoretical Physics

On the basis of the unified calculation of the thermal shifts of R-1 line, R-2 line and ground-state-splitting as well as the thermal broadenings of R, R' and B line-groups for ruby, by taking into account all the levels and admixtures of wavefunctions within d(3) electronic configuration and all the GammaM in electron-phonon interaction, the transition probabilities of direct and Raman processes have theoretically been calculated. The thermal broadenings, of R, R' and B line-groups have successfully been interpreted in terms of the direct and Raman processes of acoustic phonons. The theoretically predicted transition probabilities are in good agreement with the experimental ones.

关键词: crystal fields;electron-phonon interaction;thermal broadening;transition probability;direct and Raman processes;shifts

Phase diagram of R-Fe-Co pseudoternary system with R <= 33.3% (mole fraction, R = Sm0.5Dy0.5)

Transactions of Nonferrous Metals Society of China

Phase equilibria of the R-Fe-Co pseudoternary system with R less than or equal to 33.3% ( mole fraction, R = Sm0.5Dy0.5) were determined in an isothermal section at 1073 K and a vertical section of RFe2-RCo2 by using OM, X-ray diffractometer, EP-MA DTA techniques. There are seven intermetallic phases: (Sm, Dy) (Fe, Co)(2), (Sm, Dy) (Fe, Co)(3), (Sm, Dy)(6) (Fe, Co)(23), (Sm, Dy)(2) (Fe, Co)(7), (Sm, Dy) (Fe, Co)(5), Th2Ni17-type and Th2Zn17-type (Sm, Dy)(2)(Fe, Co)(17). The (Sm, Dy)(6)(Fe, Co)(23) phase dissolves 36% Co(mole fraction) at 1073 K. However, the (Sm, Dy)(2)(Fe, Co)(7) phase in R-2(Fe1-xCox)(7) alloys dissolves about 19% Fe(mole fraction) at 1073 K.

关键词: rare earth-iron-cobalt;phase diagram;structure;compounds;sm-co;magnetic-properties;binary-system;magnetostriction

NEUTRON DIFFRACTION STUDY ON R_2Fel_(17)N_x(R=Y,Dy,Nd)

YANG Jilian ZHANC Baisheng DINC Yongfan China Institute of Atomic Engergy , Beijing , ChinaYANG Yingchang ZHANG Xiaodong Peking University , Beijing , ChinaPAN Shuming General Research Institute for Non-Ferrous Metals , Beijing , China associate professor , P.O.Box 275 , Branch No.30 , Beijing 102413 , China

金属学报(英文版)

The N occupying sites and magnetic structures in R_2Fe_(17)N_x(R=Y,Dy,Nd)are de- termined by neutron diffraction.The effects of the site occupation of N on magnetic properties are discussed primarily.

关键词: neutron diffraction , null , null , null , null , null

SPIN REORIENTATION AND EXCHANGE INTERACTIONS IN (ND, R)2FE14B (R = Y, GD)

Journal of Magnetism and Magnetic Materials

Exchange fields in both (Nd, Y)2Fe14B and (Nd, Gd)2Fe14B series are determined by analyzing spin reorientation. Results calculated for the two systems suggest that the R-R exchange interactions between R ions are comparable with the crystal-field interaction and that their effect might be taken into account for reproducing the spin-reorientation temperature.

关键词: magnetization process;crystal;nd2fe14b;r2fe14b;transition